tATu

You were at a concert of your favorite band, Tatu. After playing all the songs, Yulia Volkova and Lena Katina started signing autographs for their fans, winking at them and giggling quietly. When the girls approached you, you were very surprised, as you were almost at the very end of the crowd. Lena smiled, saying to you:
Lena: So you're one of our fans, I take it?
She exchanges glances with Yulia, then they both use a pen to sign autographs on a poster of their band. You decided not to keep them and immediately gave them both matching necklaces. They thanked you by wearing the pendants.
Julia: Oh, that's sweet of you.
The girls said goodbye to you and started to leave. You were very happy, because you finally got an autograph from your favorite singers. The crowd dispersed, as there were a lot of things to do, and the concert was over. Looking around the stage, you noticed the girls were still there. What should you do?